Compressor for air or other aeriform bodies.



'No. 745,298. i I PATENTED NOV. 24, I903.

H. O. SERGEANT & W. RAYMOND.

COMPRESSOR FOR AIR OR OTHER AERIFORM BODIES. rr LroA'non FILED JAN.zajmoa.

10 MODEL.

No. 745,298. Patented November 24, 1903.

UNITED STATES PATENT OFFICE.

HENRY OQSERGEAN'I, OE \VESTFIELD, NEW JERSEY, AND l/VARD RAYMOND, OFEASTON, PENNSYLVANIA, ASSIGNORS TO THE INGERSOLL-SERGEANT DRILL COMPANY,OF NEW YORK, N. Y., A CORPORATION OF WEST VIRGINIA.

COMPRESSOR FOR AIR OR OTHER AERIFORM BODIES.

SPECIFICATION forming part of Letters Patent No. 745,298, dated November24, 1903.

1 Application filed January 23, 1903. Serial No, 140,206. (No model.)

To all whom it may concern: ton 9 for the low-pressure cylinder, and aBe it known that we, HENRY O. SERGEANT, piston 10 for the high-pressurecylinder.

arosidentof Westlield, in the county of Union A common head 11 isprovided for the adand State of New Jersey,and WARD RAYMOND, jacent endsof the intermediate-pressure cyl- 5 a resident of Easton, in the countyof Northinder3 and low-pressure cylinder 4, and a comampton and State ofPennsylvania, citizens mon head 12 is provided for the adjacent ends ofthe United States, have invented a new and of the high-pressure cylinder2 and the said useful Improvement in Compressors for Air low-pressurecylinder 4. These three cylinor other Aeriform Bodies,of which thefollowders are rigidly secured together, thus insur- :0 ing is aspecification. ing theirproperalinement. Thelow-pressure This'inventionrelates to what are known cylinder is represented as double-acting, andas compound compressors. the high-pressure cylinderand intermediate- Theobject of this invention is to provide pressure cylinder are representedas singlecertain improvements in the construction, acting.

15 form, and arrangement of the several parts The arrangement of theinlet and outlet whereby a simple, strong, and effective strucand theseveral valves of the compressor is as ture is provided for use as ahigh-power follows: A main inlet-pipe 13 for the fluid to compressor. becompressed is in communication with a This invention consistsinacompressor comduct 14 15 in the wall of the low-pressure cyl- 2oprising a high-pressure cylinder, an interinder, the branch 14 of whichduct leads to mediate-pressure cylinder, and a low-presan inlet-valve 16at one end of the low-pressure cylinder placed between the two and insure cylinder, and the branch 15 of the said alinement therewith,pistonsfor the three cylduct leads to an inlet-valve 17 at the other indersconnected to move together,and means end of the said low-pressurecylinder.

25 for operating the pistons. A discharge-duct 18 19 for thelow-pressure A practical embodiment of our invention is cylinder islocated in the Wall of the said cylrepresented in the accompanyingdrawing, in inder, the branch 18 of which leads to a diswhich thecompressor is shown in longitudicharge-valve 20 at one end of thecylinder, nal central section together with its tank, the and the branch19 of which leads to a diso pistons being shown at points half-way becharge-valve 21 at the other end of the cyltween the limits of theirstrokes. inder.

1 designates the tank within which the com- A tube 22 leads from thelow-pressure cyl pressor is located, the tank being intended to inderdischarge-duct 18 19 to the inlet-valve contain water for keeping theseveral partsof 23 atthe outer end of the intermediate-pres- 35 thecompressor at an oven temperature. 7 sure cylinder 3. A tube 24 leadsfrom the dis-.

The compressor as a whole comprises a charge-valve 25 at the outer endofthe interhigh-pressure cylinder 2, an intermediatemediate-pressurecylinder 3 to aninlet-valve pressure cylinder 3, and a low-pressure cyl-26 in the outer cylinder-head 27 of the said inder t, placed inalinement with one another, high-pressure cylinder. A discharge-Valve 0the low-pressure cylinder being located be- 28 is also located in thecylinder-head 27 ot' tween the high-pressure cylinder and the inthehigh-pressure cylinder, which discharge- I termediate-pressure cylinder.valve controls the escape of the compressed A single operating-rod 5passes through a fluid into the discharge-pipe 29, from which gosuitable stuffing-box 6 in the outerhead '7 of the compressed-fluidmaybe fed to a reser 45 the intermediate-pressure cylinder 3, which voiror other point. (Not shown herein.)

operating-rod 5 is developed into a piston 8' Itis to he understood thatthe severalvalves for the intermediate-pressure cylinder, a pishereinmentioned maybe made of any suitable form to suit the work to which theyare subjected and may be provided with the usual valve boxes and seats.

In a compressor constructed as herein described we are enabled toprovide a single operating-rod and stuffing-box for the three pistons,thus permitting only one point through which the d uid being compressedcan escape to the atmosphere. By making the low-pressure cylinderdouble-acting and locating the high-pressure cylinder upon one sidethereof and the intermediate-pressure cylinder upon the other sidethereof, all in alinement, we are enabled to proportion the severalcylinders so that for economical working the maximum strains in bothdirections are substantially equal and the average pressure or meaneffective pressure is also nearly constant in both directions, therebycausing a smoothly-working machine. Furthermore, the capacity of themachine is not affected by the leakage of fluid by the high-pressure andintermediate pistons occurring during the compression strokes as thefluid passes back into the compression side of the low-pressurecylinder. By combining the three cylinders we are enabled to get theminto a much smaller space than has been possible heretofore, and theconstruction at the same time is very rigid.

.What we claim is- 1. A compressor comprising a high-pressure cylinder,an intermediate-pressure cylinder and a low-pressure cylinder placedbetween the two and in alinement therewith,

pistons for the three cylinders connected to move together and means foroperating the pistons.

2. A compressor comprisingasingle-acting high-pressure cylinder, asingle-acting intermediate-pressure cylinder, and a double-act inglow-pressure cylinder placed between the two and in alinement therewith,pistons for the three cylinders connected to move together and means foroperating the pistons.

3. A compressor comprising a high-pressure cylinder anintermediate-pressure cylinder, a low-pressure cylinder, pistonstherefor, connected to move together, means for operating the pistons, acommon cylinderhead for the adjacent ends of the high and low pressurecylinders and a common cylinder-head for the adjacent ends of theintermediate and low pressure cylinders.

In testimony that we claim the foregoing as our joint invention I havesigned my name, in presence of two witnesses, this 2d day of January,1903.

HENRY O. SERGEANT. Witnesses:

FREDK. HAYNES, O. S. SUNDGREN. In testimony that we claim the foregoingas our joint invention I have signed my name, in presence of twowitnesses, this 10th day of January, 1903.

WARD RAYMOND. Witnesses:

ROBERT A. HAMILTON, H. D. MAXWELL.

